By far the single biggest challenge to my Christian faith, during this early part of my de-conversion process, came in the form of a book, by John W. Loftus, Why I Became An Atheist. I believe that most Christians have little difficulty maintaining their faith, even when challenged, since it is propped up by dozens, if not hundreds, of individual pieces (& thought patterns) they deem to be solid on their own (and even stronger together)...if one of those pieces takes a hit, hey, no big deal, there are still plenty of reasons to continue believing!...But what happens when a sizable number of those pieces, propping up your worldview, are attacked simultaneously? Well, this can cause one to question their entire paradigm, and in my case, that paradigm was the truth of Christianity.